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One separated from the world and consecrated to God; one holy by profession and by covenant; a believer in Christ (Ps. 16:3; Rom. 1:7; 8:27; Phil. 1:1; Heb. 6:10).

This word is also used of the holy dead (Matt. 27:52; Rev. 18:24). It was not used as a distinctive title of the apostles and evangelists and of a "spiritual nobility" till the fourth century. In that sense it is not a scriptural title.